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54LS190 - Synchronous 4-Bit Up/Down Counters

Description

These circuits are synchronous reversible up down counters The LS191 is a 4-bit binary counter and the LS190 is a BCD counter Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change simultaneously when so instructed by the steering logic This mode

Features

  • Y Y Y Y Y Y Y Y Y Y Counts 8-4-2-1 BCD or binary Single down up count control line Count enable control input Ripple clock output for cascading Asynchronously presettable with load control Parallel outputs Cascadable for n-bit.

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Datasheet Details

Part number 54LS190
Manufacturer National Semiconductor
File Size 180.58 KB
Description Synchronous 4-Bit Up/Down Counters
Datasheet download datasheet 54LS190 Datasheet
Additional preview pages of the 54LS190 datasheet.

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Full PDF Text Transcription

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DM54LS190 DM74LS190 DM54LS191 DM74LS191 Synchronous 4-Bit Up Down Counters with Mode Control May 1989 DM54LS190 DM74LS190 DM54LS191 DM74LS191 Synchronous 4-Bit Up Down Counters with Mode Control General Description These circuits are synchronous reversible up down counters The LS191 is a 4-bit binary counter and the LS190 is a BCD counter Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change simultaneously when so instructed by the steering logic This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple clock) counters The outputs of the four master-slave flip-flops are triggered on a low-to-high level transition of the clock input if the enable input is low A high at the enable input
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